STRUCTURAL GLASS FACADES - USC School of Architecture

For a more sophisticated program used by the glazing industry, Standards Design Group
Inc. sells a analysis program called Window Glass Design. For more information, visit
www.standardsdesign.com/WGD/2004/Default.htm.
6.4.1.3 Deflection
Deflection is a function of the support of the glass, one-sided, two-sided, three-sided, foursided
and point-fixed all represent different deflection behavior. Deflection behavior in glass
is not linear, and heat-treating glass does not affect its deflection properties.
There are no code limits on deflection, however;
“It is a common opinion that center of glass deflections greater than ¾” (19 mm) relative to
the undeflected glass plane will be aesthetically objectionable for typical glazing
installations.” (Pilkington 2005, p.1)
6.4.1.4 Thickness
Thickness is generally a function of strength and deflection. Color and appearance of glass
changes with thickness, as does sound transmission.
6.4.1.5 Color and Appearance
The evaluation of glass color is challenging. Evaluating glass colors at a conference table
under incandescent lighting from a 2-inch (50mm) sample will provide little information as to
the perceived glass color in application. Many things can affect color, including; body tint,
laminate, coatings, reflections, and interior colors. At minimum, the glass should be viewed
at the building site and in the same orientation as the actual application. A carefully
conceived mockup is the best means to assess glass color.
Many colors are possible. Sources of color include body tints, coatings such as low-E and
metallic coatings, and colored interlayer material in laminated glass. Color sources can be
284